﻿using System;
using System.Data;
using System.IO;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
using ICSharpCode.SharpZipLib.GZip;
namespace Common
{
    /// <summary>
    /// Summary description for ICSharp
    /// </summary>
    public class ICSharp
    {
        public ICSharp()
        {
            //
            // TODO: Add constructor logic here
            //
        }
        /// <summary>
        /// 压缩
        /// </summary>
        /// <param name="param"></param>
        /// <returns></returns>
        public string Compress(string param)
        {
            byte[] data = System.Text.Encoding.UTF8.GetBytes(param);
            //byte[] data = Convert.FromBase64String(param);
            MemoryStream ms = new MemoryStream();
            Stream stream = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms);
            try
            {
                stream.Write(data, 0, data.Length);
            }
            finally
            {
                stream.Close();
                ms.Close();
            }
            return Convert.ToBase64String(ms.ToArray());
        }
        /// <summary>
        /// 解压
        /// </summary>
        /// <param name="param"></param>
        /// <returns></returns>
        public string Decompress(string param)
        {
            string commonString = "";
            byte[] buffer = Convert.FromBase64String(param);
            MemoryStream ms = new MemoryStream(buffer);
            Stream sm = new ICSharpCode.SharpZipLib.BZip2.BZip2InputStream(ms);
            //这里要指明要读入的格式，要不就有乱码
            StreamReader reader = new StreamReader(sm, System.Text.Encoding.UTF8);
            try
            {
                commonString = reader.ReadToEnd();
            }
            finally
            {
                sm.Close();
                ms.Close();
            }
            return commonString;
        }
    }
}

